Nouveau - Jun 2020 - [PATCH] drm/noveau: fix reference count leak in nouveau_debugfs_strap_peek

nouveau_debugfs_strap_peek() calls pm_runtime_get_sync() that
increments the reference count. In case of failure, decrement the
ref count before returning the error.

Signed-off-by: Aditya Pakki <pakki001 at umn.edu>
---
 drivers/gpu/drm/nouveau/nouveau_debugfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index 63b5c8cf9ae4..8f63cda3db17 100644
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -54,8 +54,10 @@ nouveau_debugfs_strap_peek(struct seq_file *m, void *data)
 	int ret;
 
 	ret = pm_runtime_get_sync(drm->dev->dev);
-	if (ret < 0 && ret != -EACCES)
+	if (ret < 0 && ret != -EACCES) {
+		pm_runtime_put_autosuspend(drm->dev->dev);
 		return ret;
+	}
 
 	seq_printf(m, "0x%08x\n",
 		   nvif_rd32(&drm->client.device.object, 0x101000));
-- 
2.25.1

Thanks,

I've grabbed this, and the others of the same sort you sent out at the
same time.

Ben.

On Mon, 15 Jun 2020 at 17:29, Aditya Pakki <pakki001 at umn.edu>
wrote:
>
> nouveau_debugfs_strap_peek() calls pm_runtime_get_sync() that
> increments the reference count. In case of failure, decrement the
> ref count before returning the error.
>
> Signed-off-by: Aditya Pakki <pakki001 at umn.edu>
> ---
>  drivers/gpu/drm/nouveau/nouveau_debugfs.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> index 63b5c8cf9ae4..8f63cda3db17 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> @@ -54,8 +54,10 @@ nouveau_debugfs_strap_peek(struct seq_file *m, void
*data)
>         int ret;
>
>         ret = pm_runtime_get_sync(drm->dev->dev);
> -       if (ret < 0 && ret != -EACCES)
> +       if (ret < 0 && ret != -EACCES) {
> +               pm_runtime_put_autosuspend(drm->dev->dev);
>                 return ret;
> +       }
>
>         seq_printf(m, "0x%08x\n",
>                    nvif_rd32(&drm->client.device.object, 0x101000));
> --
> 2.25.1
>
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